- Infection inside the eye from staph, strep, enterococcus, fungal, other
- Exogenous (90-95%): complication of trauma, cataract surgery, or seeding from the outside in
- Endogenous (5-10%): spread to eye via systemic infection (e.g. bacteremia from endocarditis)
- Can be bacterial (staph, strep, other), fungal (e.g. candida), other
- Decline in vision - mild to severe based on degree of involvement
- Diffuse redness of conjunctiva
- Can involve the entire eye from anterior chamber (pus there causes white layer called hypopyon) to vitreous and retina